This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

This blog will continue to include questions, troubleshooting scenarios, and references to existing and new technologies but will grow to include a variety of different platforms and technologies. Currently I have created over 185 questions/answers in regards to the CCIE R&S track!! Note: answers are in the comment field or within "Read More" section.

You can also follow me on twitter @FE80CC1E


Sunday, April 25, 2010

Question 28

What types of storm control mechanisms are available on a switch?

1 comments:

Packets Analyzed said...

Storm control prevents a broadcast, multicast, and unicast storm from disrupting traffic on a switch. This can occur from a mis-configured network setting, errors in a protocol stack, and from a DoS attack. Storm control can be configured on an interface and is disabled by default. Storm control measures traffic usage by bandwidth or the rate at which packets are received.

Supported on a physical port or an etherchannel (when configuring storm control on an etherchannel the settings are propagated to the physical interfaces). Thresholds can also be configured.

Interface config mode
"storm-control broadcast level 10" (Level is the percentage of bandwidth)
"storm-control unicast level 10"
"storm-control multicast level 10"
(instead of level you can specify "pps" (packets per second))

Example with a low threshold configured
"storm-control broadcast level 10 5" (anything higher the 10 percent will shut the port down but if the traffic falls to 5 percent the port will start to forward traffic again.)

"storm-control action (shutdown|trap)"
shutdown - errdisable the port
trap - sends an SNMP trap

Post a Comment